A government agency was charged by the legislature with estimating the length of time it takes citizens to fill out various forms. The agency generated an 85% confidence interval, a 90% confidence interval, and a 99% confidence interval, all of which are listed below. Which one is the 85% confidence interval?

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Answer:

The shorter range.

Step-by-step explanation:

When you think about the confidence interval you automatically think about how wide it is, in relation to its range. A typical confidence interval is generally 95%, however when it increases, it also increases the 'confidence' of the data and therefore its range.

Logically, a level of confidence of 85% will be much narrower than one of 90%, 95% or 99%, this implies that the wide range will be narrower than that of others. So things the 85% confidence interval in a multiple selection response, compared to the other three intervals, will always be the shortest.

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Based on the information given, the 85% confidence interval would have the least numerical value.

What is a confidence interval?

In Mathematics, a confidence interval can be defined as a range of estimated values that defines the probability that a population parameter will lie within it.

This ultimately implies that, a confidence interval is an estimate of a range of estimated values (lower bound and an upper bound) that may contain a population parameter.

For confidence interval 85%;

[tex]\alpha =1-0.85\\\\\alpha =0.15[/tex]

For confidence interval 90%;

[tex]\alpha =1-0.90\\\\\alpha =0.10[/tex]

For confidence interval 99%;

[tex]\alpha =1-0.90\\\\\alpha =0.01[/tex]

Based on the above computations, the 85% confidence interval would be the narrowest and has the least numerical value while the 99% confidence interval would have the largest numerical value.

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